From: Loic Poulain <loic.poulain@linaro.org>
Date: Wed, 30 Jan 2019 16:48:07 +0000 (-0500)
Subject: media: i2c: ov5640: Fix post-reset delay
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1d4c41f3d887bcd66e82cb2fda124533dad8808a;p=linux.git

media: i2c: ov5640: Fix post-reset delay

According to the ov5640 specification (2.7 power up sequence), host can
access the sensor's registers 20ms after reset. Trying to access them
before leads to undefined behavior and result in sporadic initialization
errors.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 2387c29b7fb0f..5278c8723fdd5 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -1939,7 +1939,7 @@ static void ov5640_reset(struct ov5640_dev *sensor)
 	usleep_range(1000, 2000);
 
 	gpiod_set_value_cansleep(sensor->reset_gpio, 0);
-	usleep_range(5000, 10000);
+	usleep_range(20000, 25000);
 }
 
 static int ov5640_set_power_on(struct ov5640_dev *sensor)